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Battery Tender Junior - User Manual

Battery Tender Junior
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1
12 & 6 Volt Models:
750 Milliamp & 1.25 Amp
&
8 Volt Model 1.25 Amp
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS: This manual contains
important safety and operating instructions for BATTERY TENDER®
CHARGERS, both the 12 & 6 Volt 750 Milliamp BT JUNIOR and 12, 6,
& 8 Volt 1.25 Amp BT PLUS models. CAREFULLY READ THESE
INSTRUCTIONS BEFORE USING THE BATTERY CHARGER.
WARNING AND CAUTION LABEL DEFINITIONS:
WARNING
WARNING indicates a potentially hazardous situation, which, if
not avoided, could result in serious injury or death.
CAUTION
CAUTION indicates a potentially hazardous situation, which, if not
avoided, may result in minor or moderate injury.
CAUTION
CAUTION used without the safety alert symbol indicates a
potentially hazardous situation that if not avoided, may result in
property damage.
GENERAL PRECAUTIONS
WARNING
Battery posts, terminals and related accessories contain lead and
lead components, chemicals known to the State of California to
cause cancer and birth defects or other reproductive harm.
Always wash your hands after handling these devices.
WARNING
Do not operate the battery charger with damaged AC power cords
or plugs or DC output cords or accessories - Replace accessories
immediately. Since neither the AC power cord nor the DC output
cord can be replaced, if either cord is damaged the battery
charger should be scrapped.
Battery Tender® JUNIOR &
Battery Tender® PLUS
Battery Chargers
392-0154-R0
2
CAUTION
WORKING WITH LEAD ACID BATTERIES AND BATTERY CHARGERS:
All lead acid batteries have the potential to emit gasses that may combine into
a combustible or explosive mixture. In many cases, it is possible that lead acid
batteries will emit these gasses during normal discharge and charging
operations. Because of this potential danger, it is important that you follow the
precautions recommended by both the battery and battery charger
manufacturers before using either one.
USING MANUALS: Study all of the battery manufacturer's precautions and
specific recommendations for safe operation such as not removing cell caps
while charging and the recommended rates of charge (charger output current).
CAUTION
CHARGER VOLTAGE COMPATIBILITY: NEVER use a battery charger
unless the battery voltage matches the output voltage rating of the charger.
For example, do not use a 12-volt charger with a 6-volt battery and vice-versa.
CHARGER LOCATION: LOCATE the charger as far away from the battery as
is allowed by the length of the output cable harness. NEVER set the charger
above the battery. NEVER set the charger on a surface constructed from
combustible material. NEVER place the battery, the charger, or any of the
electrical connections between them in an area that is likely to become wet.
EXCESSIVE MOISTURE: Do not expose the battery charger or any of its
electrical connections (either AC or DC) to rain, snow, or extremely high,
condensing humidity.
CHARGER ATTACHMENTS: Do not use attachments that are not
recommended or sold by the charger manufacturer. To do otherwise may
result in the risk of electric shock, fire, or possibly some other unforeseen
potential personal injury situations.
HANDLING POWER CORDS: When handling electric power cords, always
pull by the plug rather than by the cord. This will reduce the risk of damage to
both the plug and cord, and it will minimize the likelihood of electric shock
resulting from that damage.
LOCATION OF POWER CORDS: Make sure all electric power cords are
located so that they cannot be stepped on, tripped over, or otherwise
subjected to damage or stress.
MONITORING SEALED & NON-SEALED BATTERIES: When leaving a
battery charger connected to either a sealed (AGM or GEL) or non-sealed
(flooded battery) for extended periods of time (weeks, months, etc.),
periodically check the battery to see if it is unusually warm. This is an
indication that the battery may have a weak cell and that it could go into a
thermal runaway condition. If the battery releases an excessive amount of gas
or if the battery gets hotter than 130°F (55°C) during charging, disconnect the
charger and allow the battery to cool. Overheating may result in plate
distortion, internal shorting, drying out or other damage. For flooded batteries,
also check individual cell fluid levels against manufacturer's recommendations
for safe operation.

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Questions and Answers

  • E
    eugenewhiteJul 27, 2025
    What to do if the red light comes on again after the green light on Battery Tender Junior Battery Charger?
    • C
      Christopher WareJul 27, 2025
      If the red light on your Battery Tender Battery Charger comes on again after the green light was already on, it could be due to a few reasons. Another appliance might be drawing electric power from the battery, causing its voltage to drop. Disconnect any other appliances drawing power from the battery. The charger connections at the battery might be intermittent, so check the charger connections at the battery. Alternatively, the battery itself may be defective, and in that case, consider replacing the battery.
  • D
    dellisAug 3, 2025
    How to fix Battery Tender Junior when no lights turn on?
    • W
      wvalenciaAug 3, 2025
      If neither of the lights on your Battery Tender Battery Charger turn on after connecting the AC power plug, first check the charger's AC power plug connection at the AC electrical outlet and verify that the outlet is functioning properly by plugging in another appliance or a voltmeter. For the 0.75 A model, also ensure that the charger output is properly connected to the battery.
  • J
    James LewisAug 10, 2025
    Why Battery Tender Battery Charger is charging, but the green light does not turn on?
    • A
      Anthony CooperAug 11, 2025
      If your Battery Tender Battery Charger is charging, but the green light isn't turning on as expected, it could be due to several reasons. The battery might be large and require more time to fully charge. Give the battery more time to charge. Another appliance might be drawing power from the battery while it's charging; in this case, disconnect any other appliances drawing power from the battery. The battery itself might be defective, or if it's a newly purchased battery, it may not be fully charged initially, so allow additional charging time.
  • H
    hilltimothyAug 18, 2025
    Why does the green light go on immediately on Battery Tender Battery Charger?
    • A
      Andrew HaleAug 18, 2025
      If the green light on your Battery Tender Battery Charger goes on immediately when AC power is applied, it could be due to a few reasons. The charger connections at the battery may be intermittent, so check them. The battery may be defective, consider replacing it. It's also possible that the battery is already fully charged, so try using the charger on a different, uncharged battery.

Summary

Important Safety Instructions

General Precautions

General safety advice, including handling lead components and damaged cords.

Working with Lead Acid Batteries and Battery Chargers

Specific Safety Warnings

Electric Spark & Open Flame

Never smoke or allow sparks near batteries or engines.

Personal Precautions

When You Work Near Lead-Acid Batteries

Safety advice for working near lead-acid batteries, including personal protection.

Preparing to Charge

If the Battery Must Be Removed from the Vehicle

Steps for safely removing a battery from a vehicle for charging.

Charging the Battery While Installed

Connecting the Charger

Procedure for connecting the charger to a battery installed in a vehicle.

Status Indicator Lights

Indicator Light Operation

Describes the meaning of indicator lights for different charging states.

Troubleshooting

Troubleshooting Check List

Lists common issues and checks for charger not powering on or lights not working.

Battery Tender Junior Specifications

General IconGeneral
Output Voltage12V DC
Output Current0.75A
Input Voltage120V AC
Battery TypeAGM, Gel
Battery CapacityUp to 30Ah
Safety FeaturesSpark-proof, reverse polarity protection
Connector TypeAlligator Clips and Ring Terminals

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